Find out the wrong statements and write them in their correct form.

(a) We can survive for some time without air but we cannot survive even for a few minutes without food.
(b) A brick kiln emits a lot of smoke and other harmful gases causing air pollution.
(c) Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel.
(d) Chlorination is a commonly used chemical method for killing germs in the water.
(e) Water that is suitable for drinking is called soft water

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Solution

(a) Wrong statement
We can survive for some time without food, but we cannot survive even for a few minutes without air.

(b) TRUE
A brick kiln emits a lot of smoke and other harmful gases causing air pollution.
(c) Wrong
Carbon monoxide is produced by incomplete burning of fuels such as coal, petrol, diesel is the right statement.

(d) True

Chlorination is a commonly used chemical method for killing germs in water.
(e) Wrong statement

The correct statement is - Water which is suitable for drinking is called potable water.

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Similar questions

Question 23
Find out the wrong statements and write them in their correct form.
(i) We can survive for some time without air but we cannot survive even for a few minutes without food.
(ii) A brick kiln emits a lot of smoke and other harmful gases causing air pollution.
(iii) Carbon monoxide is produced by the complete burning of fuels such as coal, petrol, diesel.
(iv) Chlorination is a commonly used chemical method for killing germs in water.
(v) Water which is suitable for drinking is called soft water.

Q. Humans can survive without water for a few weeks.

Q. Write balanced chemical equations for the following:
(a) burning of coal (carbon) in a sufficient supply of air
(b) When coal burns in insufficient amount of oxygen, carbon monoxide is formed.
(c) Name the type of reaction in each of the above cases.
(d) How is carbon monoxide harmful?

Q. Mark the following statements as true or false. Correct the false statements.
(a) Water pollution is caused by the smoke given out by factories.
(b) Pesticides and fertilisers cause both soil and water pollution.
(c) Breathing in suspended particulate matter is not as harmful as breathing in carbon dioxide.
(d) Fertilisers provide nutrients to the soil, therefore they cannot be replaced.
(e) There are no alternatives for fossil fuels.

Question 21
Fill in the blanks with the help of words given in bracket after each sentence.
(a) When air is contaminated by___ substances which have a ___ effect on both the ___ and ___, it is referred to as ___. (air pollution, harmful, living, unwanted, non-living, pollutants).
(b) Many ___ are responsible for causing ___ pollution. Petroleum ___ are a major source of ___ pollutants like ___ and ___. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).
(c) While ___ your teeth, leaving the ___ running may waste several ___ of water. (tap, litres, brushing, washing, drops)
(d) Water which is suitable for ___ is called ___ water. (washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has disease carrying ___and ___ impurities. (insects, microorganism, particles, dissolved, harmful).

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